[ale] seeking backup with versioning

[PairOfTwins]

All:

In searching ale.org, I see ext4 in discussions of versioning.  I've 
been asked (finally) to replace a Win2K server, which houses the 
database for 7 Windoze workstations.  Since the office manager just lost 
6 weeks of Outlook emails when the pst file was corrupted AND the copy 
done by nightly backup was also corrupted ---- keeping prior versions is 
a basic requirement.

eBox uses rdiff-backup
ClearOS I can't determine
FreeNAS I can't determine
Ubuntu Server uses BackupPC or Bacula

As an Ubuntu user, I'm most comfortable with deb distros.  Anyone have a 
suggestion of a server distro with suitable backup built in, or shall I 
use Ubuntu server?

Thanks,
Tom